Compressors, Gas Turbines and Jet Engines
The clearance volume of the air compressor is kept minimum because

It results in minimum work
It allows maximum compression to be achieved
It greatly affects volumetric efficiency
It permits isothermal compression

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Compressors, Gas Turbines and Jet Engines
Water gas is produced by

Partial combustion of coal, eke, anthracite coal or charcoal in a mixed air steam blast
Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 65°C
Carbonisation of coal

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